Boots – shoes – and leggings
Patent
1993-02-22
1995-04-25
Teska, Kevin J.
Boots, shoes, and leggings
364454, 73178R, C06F 1550
Patent
active
054104874
ABSTRACT:
A counting section includes: a first gyro pulse counter which counts gyro pulses from each of X-, Y-, Z- and S-axis gyroscopes during each counting period after being reset immediately before the start of the counting period and outputs the count value as a first gyro pulse count value at fixed time intervals; and a second gyro pulse counter which is reset at said fixed time intervals, counts the gyro pulses and outputs the count value as a second gyro pulse count value. A dynamic error calculating section includes: gyro multipliers/subtractors whereby, for each combination of two different main axes, a mutual product difference of the gyro pulse count values for the two axes is calculated as a main-axis system gyro pulse error and, for each combination of one of the X, Y and Z axes and the S axis, a mutual product difference of the gyro pulse count values for the S axis and each of the X, Y and Z axes is calculated as an auxiliary-axis system gyro error; and a gyro error integrating section whereby each of the X-axis, Y-axis and Z-axis system gyro errors and the auxiliary-axis system gyro error, provided at the fixed time intervals, are accumulated within each calculation period to obtain a gyro error integrated value. A strap-down calculating processor uses the gyro error integrated values from the gyro error integrating section to calculate the correctional quantity of a coning error for each system wherein one of the X, Y and Z axes is replaced with the S axis.
REFERENCES:
patent: 4675820 (1987-06-01), Smith et al.
patent: 4914598 (1990-04-01), Krogmann et al.
patent: 5001647 (1991-03-01), Rapiejko et al.
patent: 5050087 (1991-09-01), Walrath et al.
patent: 5301114 (1994-04-01), Mitchell
Hirose Yoshio
Ito Satoshi
Kobayashi Masao
Okayama Hiroshi
Japan Aviation Electronics Industry Limited
Teska Kevin J.
Wieland Susan
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